Remove duplicate puppet declaration

In the gemspec we declare puppet two times
causing installation of the gem to fail.

Change-Id: Ie0fad5151475391b877d308fee4a1d00387c9d51

puppet-openstack_spec_helper.gemspec

@@ -48,10 +48,6 @@ Gem::Specification.new do |spec|
   # fog-core 1.44.0 requires xmlrpc 0.3.0 which requires ruby 2.3.0 which is not available on centos7
   spec.add_dependency 'fog-core', ['< 1.44.0']
 
-  # puppet 4.10.4 added in a failure when using ruby 2.0.0, so we need to cap
-  # puppet at 4.10.3 to fix CI
-  spec.add_dependency 'puppet', ['< 4.10.4']
-
   # Beaker 3.0.0 fails to run in Puppet Openstack CI
   # LoadError: cannot load such file -- serverspec
   # While we're investigating it, let's pin Beaker to 2.x releases.